/*
 * Copyright (c) 2019 - now, Eggroll Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *
 */

package com.webank.eggroll.core.util

import io.grpc.Metadata
import io.grpc.stub.StreamObserver

abstract class GrpcCalleeStreamObserver[R, E](val caller: StreamObserver[E])
  extends StreamObserver[R] with Logging {

  override def onError(throwable: Throwable): Unit = {
    val grpcThrowable = ErrorUtils.toGrpcRuntimeException(throwable)
    caller.onError(grpcThrowable)

    logError("callee streaming error", throwable)
  }

  override def onCompleted(): Unit = {
    caller.onCompleted()
  }

}

object GrpcUtils {
  def toMetadata(kvs: Map[String, String]): Metadata = {
    val result = new Metadata()

    kvs.foreach(kv => {
      result.put(Metadata.Key.of[String](kv._1, Metadata.ASCII_STRING_MARSHALLER), kv._2)
    })

    result
  }
}
